When creating selector CASE statements, you cannot have NULL in the list of possible values. In PL/SQL the Boolean expression NULL=NULL evaluates to FALSE. To fix it, wrap the selector in an NVL expression to be sure that it could never be NULL: ...
The CASE statement executes a set of one or more statements when a specified search condition is true. CASE is a standalone statement that is distinct from the CASE expression, which must appear as part of an expression.
There are a few differences betweencasein PL/SQL andOracle SQL. Using case in PL/SQL There are several enhancements tocaseavailable in PL/SQL: casestatements Extendedcasecontrols (from 23ai) Case statements in PL/SQL A case expression returns a single value. In PL/SQL you can write a case...
This Oracle tutorial explains how to use the Oracle/PLSQLCASE statementwith syntax and examples. Description The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement. Syntax The syntax for ...
The CASE statement executes a set of one or more statements when a specified search condition is true. CASE is a standalone statement that is distinct from the CASE expression, which must appear as part of an expression.
CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ... WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN...
1、PL/pgSQL 代码块结构 [ <> ] [ DECLARE declarations ] BEGIN statements; ... END [ label ]; 结构说明: label 是一个可选的代码块标签,可以用于 EXIT 语句退出指定的代码块,或者限定变量的名称; DECLARE 是一个可选的声明部分,用于定义变量; BEGIN 和...
Different Formats of CASE Statements A simple CASE statement expression In this format, we evaluate one expression against multiple values. In a simple case statement, it evaluates conditions one by one. Once the condition and expression are matched, it returns the expression mentioned in THEN cla...
.. ELSE -- statements for other conditions END; 在这个例子中,根据不同的条件,CASE语句块会执行相应的语句。 PL/SQL中的CASE语句可以用于各种场景,例如根据不同的条件执行不同的逻辑、根据不同的条件返回不同的结果等。 对于PL/SQL开发,腾讯云提供了云数据库 TencentDB for Oracle,它是一种高性能、可扩展的...
1、Loop……end Loop语句标准格式: LOOP statement_list--循环代码块 IF exit_condition THEN EXIT;--满足IF条件 退出循环...pl/sql中“=”表示比较,“:=”表示赋值。...--标准格式: While loop 要执行的语句; ...